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FunBot U.S 3/8

by madmike8, published

FunBot U.S 3/8 by madmike8 Feb 23, 2015
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This is my Funbot built using 3/8" rods/tubes and bronze bushings.

The default STL's for the funbot are already 3/8" which makes it nice. I wanted to use bronze bushings, so I made an adapter from the bronze bushings to the LMU10 bearings it's designed for. I bought the bushings and 12" stainless rods(Z Axis) and 12" aluminum tubes(X & Y Axis) from servocity.com. I'm not sure yet how well the aluminum tubes are going to work, so you might just want to get the stainless rods for all axis until I have tested it. I bought a couple 8"x8"x1/8" aluminum plates for the bed and had a 11.5"x12"x1/2" aluminum plate for the base. My base is way too thick, but I had it already. A 1/4" thick plate would have been better. I wanted a Bowden extruder, so I made a simple mount that mounts over the Spool Plates and still lets them adjust. It holds the extruder in a 45 degree angle to hopefully help with the filament feeding. I've followed Cliff's video build tutorials for assembly. I'm no 3d designer, so I'm including the SCAD files in hopes it allows other to tweak/fix/upgrade what I've done easily.

3/8"x3/4" Bronze Bushings AGB-A2-20 $1.75 https://www.servocity.com/html/bronze_bushings.html
3/8"x12" Stainless Rods 634222
$5.89 https://www.servocity.com/html/3_8__precision_shafting.html
3/8"x12" Aluminum Tubes 635250 $3.99 https://www.servocity.com/html/3_8__hollow_aluminum_tubing.html
The bed plates I purchased off ebay.

I recommend using the Z carriage with TR8 Leadscrew from Djinn5150's remix.
He also has a nice Hotend holder, X Belt tensioner available

All wired up now. Just need to calibrate and print!

Link to the Funbot Build Thread

First Print Video

Printing Zombie Hunter. Still haven't tuned it.


I think I have the Slicer config working pretty good now for the Bowden Extruder. The Retract and Support settings are really working good for this printer. So, I've included the Sli3er config and bundle. You will need to change the Bed Size and Nozzle size for your build. Added a pic of 3D Benchy Printed with this Config.

10/27/15 Made a change to the extruder support for easier printing

11/12/15 Added Hotend Mount that works with Chinese style E3d Hotends and has a mount for Inductive Sensor for autobed leveling. The Inductive Sensor is offset 23mm from the Hotend on the Y axis.

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How do you prevent the X axis from sagging? Mine seems to have a fair bit of sag towards the far end. I'm using 3/8" Aluminum rods with PLA bushings.

Comments deleted.

how are the aluminum tubes vs the m8 rods?

Tubes work well with the bushings. Rods work with the bearings. I like the M8 version.

I have to choose between FunBot & Smartrap
I think FunBot will give z-axis more stable
and lower moving mass in x-axis
I choose FunBot
How do you think?

I had a Smartrap. But it was just too flimsy. That's why I built a Funbot. It's very stable. I finally converted the Funbot STL's to use the M8 rods on my Smartrap, and took it apart to build the M8 Funbot. Still very stable. So far I've built 4 Funbots. So you know how I feel about them. Watch Cliff's build videos from the original design to get an idea of how it all goes together. I've only built Bowden versions and suggest to all that build them to use Bowden too. Hanging a big heavy stepper on the X axis only supported on one side might give problems. The Bowden tube itself is pretty short so it doesn't give much issues when setting things up. If you have any questions on your build, just let me know.

Out of curiosity, what drill bit did you use for the base plate? I'm still not really clear on that. I'm kinda following the thread on reprap but I'm still fuzzy on a few things. Namely the drilling and I'm probably using your bowden mounting but I'm not sure what extruder to use if I want to ultimately have a funbot that can support an E3D cyclops or chimera. Bowden extruders are my biggest area of ignorance. plus you seem to be the stateside funbot guru.

If it can tote around a mk8 it should be able to handle either of those. I would probably use 3/8" drill or the stainless ones I used on the Z axis instead of the aluminum tubes though.

For drilling the mounting board, I used a 3mm to drill all the way through the board. And then used a 6mm bit on the bottom to counter sink the holes halfway through the board. You could probably get away with 1/8" and 1/4" bits too.

I'll give it a shot, hopefully I can find my metric tools. I'm doing my best to buy the parts at Lowe's or local hardware stores. it's proving difficult with the screws. Can I mount the z axis and everything without the motors? I have them ordered but I would like to get things a little together.

Yes, You can mount the Z base with out the stepper. The M3 hardware is harder to source at Lowes. You might see if your town has a Fastenal or Grainger near by. I bulk buy the bits because I build so much junk :)

I'm about to drill a board for the base of the 8mm version I'm making. I'll try to get some pics for you.

Interesting design, very cost effective, I dig it.

I look forward to seeing the finished machine. The Funbot is a fabulous creation and it is nice to see it evolve.

Thanks mike for sharing ;)
And you know I think its awesome ;)