For makerbot-desktop 3.8.0, https://aur.archlinux.org/packages/makerbot-desktop

makerbot-desktop.install

post_remove() {
	update-mime-database /usr/share/mime
	update-desktop-database -q
	gtk-update-icon-cache
	[[ -z $2 ]] && echo -e "Stopping conveyor.service"
	[[ -z $2 ]] && echo -e "Disabling conveyor.service"
	systenctl disable conveyor 2>/dev/null
	userdel -r conveyor >/dev/null 2>/dev/null
	[[ -z "$2" ]] && echo -e "Restoring /run/lock's permissions"
	chmod g-w /run/lock
	true
}

post_install() {
	## Reuse post_remove code
	post_remove "null" "null"
	
	## Create conveyor user
	echo -e "\nAdding user: conveyor"
	if ! getent passwd conveyor >/dev/null; then
		useradd --system \
			-M -d /dev/null \
			--shell /bin/false conveyor
		gpasswd -a conveyor lp
		gpasswd -a conveyor uucp
	fi
	# Create and set permissions for /var/run/conveyor
	mkdir -p -m 3777 /var/run/conveyor
	chmod g+s /var/run/conveyor
	chgrp conveyor /var/run/conveyor
	# Set proper permissions for any existing lock files
	chgrp conveyor /var/run/conveyor/* >/dev/null 2>&1 || true
	chown conveyor /var/run/conveyor/* >/dev/null 2>&1 || true
	chmod 0644 /var/run/conveyor/* >/dev/null 2>&1 || true

	# Create and set permissions for /var/log/conveyor
	mkdir -p -m 3777 /var/log/conveyor
	chmod g+w /var/log/conveyor
	chgrp conveyor /var/log/conveyor
	# Set proper permissions for any existing log files
	chgrp conveyor /var/log/conveyor/* >/dev/null 2>&1 || true
	chown conveyor /var/log/conveyor/* >/dev/null 2>&1 || true
	chmod 0664 /var/log/conveyor/* >/dev/null 2>&1 || true
	
	echo -e "Changing /run/lock's permissions. Setting g+w"
	chmod g+w /run/lock
	
	gpasswd -a conveyor root

	chown /var/log/conveyor/conveyord.log
	
	## Enable and start conveyor service
	msg2 "Enable and start conveyor.service to be able to connect to printer\n #~ systemctl enable conveyor.service && systemctl start conveyor.service"
}

post_upgrade() {
		touch /var/log/conveyor/conveyord.log
        chown conveyor /var/log/conveyor/conveyord.log
        #msg2 "Please restart conveyor.service with\n #~ systemctl restart conveyor.service"
}

PKGBUILD

# Maintainer: Francisco Martinez <zomernifalt at gmail dot com>
pkgname=makerbot-desktop
pkgver=3.8.0
_openmeshver=3.2_3.2
pkgrel=2
pkgdesc="A complete, free 3D printing solution for discovering, managing, and sharing your 3D prints."
arch=('x86_64')
url="https://www.makerbot.com/desktop"
license=('GPL')
depends=('boost' 'glibc>=2.4' 'hicolor-icon-theme' 'libdbus>=1.0.2' 'libgl' 'qt5-base>=5.3.0' 'qt5-webkit>=5.0.2' 'zenity' 'zlib>=1.1.4')
options=('!strip')
install="$pkgname.install"
_fakeubunturelease=15.04
_baseurl="http://downloads.makerbot.com/makerware/ubuntu/pool/main"

if [ $CARCH == "x86_64" ]; then
    _arch="amd64"
    md5sums=(
        'd80b74478b91d2145a3ca809437bc426'
        '6971eaa9d67001aa73e4739bf36780d6'
        'c8c59831ef18615de4fe4c322d7726b6'
        '3f617f3a6a9c0bf2fd42920bed7868a3'
        'e0c6678cb4dba22c04e173b63eb711e1'
        '51b5f5afa0750582bb0603643b8abb49'
        '9caaa528f50a3b4a5082361a09457b4d'
        'b81ca46ec103428452cc6042e0338f4a'
        # '960a9946a5d20b8e35936d8e55b97da8'
        '0a4814dd96e5ab61a26b0b03f01173dc'
        '94134f3f575b327006cc0524037dce87'
        '8545ac7f1db4c7a2d23f5864b6f78a9b'
        '14cad79fd2ba8862c75166986261752e'
        'e96db9bf01aab3b00d72cb7f9e541d90')
else
    _arch="i386"
    md5sums=(
        '2c28b1732a6f2053df1b1e4c08ff0c4f'
        '45faed2b2c244e2c1879d3ba68a93616'
        'c91f77866d1c83d707616745cf37285c'
        '0f77872559c4d9c6cb0880df18824e7a'
        '9b3d3dac9590a06216b549506d10ad3d'
        'bccccd52305356ecca096c6c9b9aea06'
        '2aa71634bf86a0aee2ffd6bea9abb811'
        '9e0a389f8644f283a57a7e4d32a0dac6'
        # '15f5ff9c402fff71b59e93a98ff46325'
        '437590ee186f57c7effaf6bdbe0fd007'
        '52c78dc84e9a695bb12f0e16bbdbb9ec'
        'ee24c1da5b85fb146e3ef6164031447c'
        '93903b032f99a0efcf3c270673f2be2d'
        '3aabeea413dab5b9a1085d26572d4599')
fi

source=(
"$_baseurl/m/makerware/makerware_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/conveyor_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/conveyor-common_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/conveyor-ui_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/libmbqtutils_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/libthing_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/libtinything_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/libtoolpathviz_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
# "$_baseurl/m/makerware/mb-libjsoncpp_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/mb-fopenhack_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/mb-libjsonrpc_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/mbacceleration_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/m/makerware/sliceconfig_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"$_baseurl/o/openmesh/libopenmesh-${_openmeshver}-${_fakeubunturelease}_${_arch}.deb")
noextract=(
"makerware_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"conveyor_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"conveyor-ui_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"conveyor-common_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"libmbqtutils_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"libthing_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"libtinything_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"libtoolpathviz_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
# "mb-libjsoncpp_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"mb-fopenhack_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"mb-libjsonrpc_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"mbacceleration_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"sliceconfig_${pkgver}-${_fakeubunturelease}_${_arch}.deb"
"libopenmesh-${_openmeshver}-${_fakeubunturelease}_${_arch}.deb")


install="$pkgname.install"

package() {
    cd ${pkgdir}
	
    msg2 "Extracting DEBs"
    for file in $srcdir/*.deb; do ar p $file data.tar.xz | tar -xJ; done

    msg2 "Moving files around"
	mv lib/udev/ usr/lib/
	rm -r lib

    for i in program_options filesystem system serialization date_time; do
        ln -fs /usr/lib/libboost_$i.so usr/lib/libboost_$i.so.1.55.0
    done

    #msg2 "Creating log files"
	#touch /var/log/conveyor/conveyord.log
    #chmod g+w /var/log/conveyor/conveyord.log
}

Current Status:

makepkg builds the Package without complaining, pacman -U outputs the following message, but installs makerware:

loading packages...
resolving dependencies...
looking for conflicting packages...

Packages (1) makerbot-desktop-3.8.0-2

Total Installed Size:  100,27 MiB

:: Proceed with installation? [Y/n] 
(1/1) checking keys in keyring                                                                                [#################################################################] 100%
(1/1) checking package integrity                                                                              [#################################################################] 100%
(1/1) loading package files                                                                                   [#################################################################] 100%
(1/1) checking for file conflicts                                                                             [#################################################################] 100%
(1/1) checking available disk space                                                                           [#################################################################] 100%
:: Processing package changes...
(1/1) installing makerbot-desktop                                                                             [#################################################################] 100%

Adding user: conveyor
Adding user conveyor to group lp
Adding user conveyor to group uucp
Changing /run/lock's permissions. Setting g+w
Adding user conveyor to group root
chown: missing operand after ‘/var/log/conveyor/conveyord.log’
Try 'chown --help' for more information.
/tmp/alpm_nyXYoq/.INSTALL: line 55: msg2: command not found
error: command failed to execute correctly
:: Running post-transaction hooks...
(1/1) Updating the desktop file MIME type cache...

Then when running makerware, it crashed with the following message:

/usr/bin/../share/makerbot/makerware: symbol lookup error: /usr/bin/../share/makerbot/makerware: undefined symbol: _ZN4Json6Reader5parseERKSsRNS_5ValueEb

makerbot-desktop is still being built against the very old jsoncpp0.6.0rc2 or something like that. You can build that version by using the PKGBUILD linked in the AUR discussion for makerbot-desktop: https://gist.github.com/madc/de7e9dacb9c3c5f31ec9

With this package installed for jsoncpp, makerware will run, but conveyor-svc still does not. It gives error:

Traceback (most recent call last): File "/usr/share/makerbot/python/conveyor-3.8.4-py2.7.egg/conveyor/server/__init__.py", line 29, in <module> ImportError: No module named serial
I should also mention that I used the latest makerbot-desktop - _fakeubunturelease 16.04 and pkgver 3.9.1

Okay, I spent the last day messing with it, and have made a package I'm able to print with, but not change settings. Take a look, if you are still interested in getting this to work: https://gist.github.com/TheFeshy/6a47267495359e90627594a34c313b09

Sorry for the late reply. Seems, one does not get notifications on comments here. Unfortunately, I', quite busy atm but I'll have a proper look at it as soon as possible. The PKGBUILD above was not my last try and i managed to run the Makerbot software once (with a new version of jsoncpp0), but got some errors when i tried to run it again.