Mulbot - The Mostly Printed 3D Printer

The Mulbot is an open source Mostly Printed 3D printer that features a 3D printed frame, bearing blocks, and drive systems. The original goal for this project is to further push the Rep Rap concept and to 3D print more than just the frame. As a result there are no purchased bearing assembles or drive systems on this printer.

This printer utilizes square rail type 3D printed housings for linear bearings. Since the bearings and rails are printed they have been integrated into the frame members. 4.5mm G100 Stainless Steel bearings balls are used to recirculate through the bearing housings to reduce fiction and to provide preload to remove bushing slop.

All three of the printers drive systems are 3D printed as well. The Y-axis is driven by a 3D printed herringbone gear rack and pinion. The combination of 3D printed drive and idle pulleys and a TPU belt drive the X-axis hot end carriage. While the Z-axis utilizes 3D printed trapezoidal lead screws and nuts to translate the hotend vertically.

Specifications
Print Surface:
8-1/2” Square Floating Glass Bed

Print size:
175mm x 200mm x 150mm (dual fan shroud)
145mm x 200mm x 150mm (surround shroud)

Required Print Volume:
250mm x 210mm x 210mm
The original Mulbot was printed on a Original Prusa MK3

Filament Used
Everything is designed to be printed out of PLA with the exception of the TPU timing belt.
Uses less then 2kg of filament.

Non-Printed Parts
SeemeCNC EZR Extruder
E3D V6 Lite Hotend
Ramps 1.4 Mega Controller
Capricorn XC 1.75 Bowden Tubing
5630 LED Strip Lights
150W 12V Power Supply
IEC320 Inlet Plug with Switch
Blower Fan

See it printing here: https://youtu.be/Ob4yieqQDis

STL's and more information
STL's and more information can be found on the github. I want to keep everything in one place.

https://github.com/3dprintingworld/Mulbot