Disable cache_render or other cache bins in Drupal 8

services.yml

services:
  cache.backend.memory:
    class: Drupal\Core\Cache\MemoryBackendFactory

settings.php

<?php
// First line will not be needed after https://drupal.org/node/2241633.
// For more cache docs see https://api.drupal.org/api/drupal/core%21modules%21system%21core.api.php/group/cache/8
$GLOBALS['conf']['container_yamls'][] = $conf_path . '/services.yml';
$settings['cache']['bins']['render'] = 'cache.backend.memory';

Huge thanks to @Berdir and @sun in IRC for helping me put this together!

Put the services.yml in sites/default/services.yml and add the lines to your settings.php.

That code comment as a link: https://drupal.org/node/2241633