Ultimate Voron AB Belt Installation Tool

Introduction

This remix expands upon tools used to temporarily hold the A/B drive belts of a VORON Trident or 2.4 printer on the X axis while installing the toolhead. The VORON StealthBurner has belt clamps that face the carriage of the X gantry rail and it is tricky to hold the belts in place while you position the toolhead piece to fasten it. This version of the tool uses a clamp that will clamp to the 2020 X axis extrusion and rail. After the clamp is position a grippy belt clamp is used to position the belts exactly. At that point it is fairly trivial to adjust the belt lengths and position laterally and fasten the toolhead mount. The tools this was remixed from did made the clamp to extrusion and clamp belt all part of the same operation which made things harder when initially installing the belt. They probably work fine if you have the belt already in place and want to hold them while you remove the toolhead to work on it or swap it and then refasten it. But if your belts are not already fastened to a tool head I found them hard to use. I think my version makes it about as simple as it can possibly get, but YMMV.

Bill of Materials

• 2 Copies of the printed parts

• 8 M3 x 12mm socket head screws

• 2 M3 x 18mm socket head screws

• 12 M3 heatset inserts

Printing

The parts should get placed in your slicer in the printing orientation. You will need two copes of them to hold the belts on the left and right side of the carriage. I don't think the material you use matters very much. I used ASA since I already had it loaded in my printer and I have good settings for it. But a basic PLA should work fine. You do want something with decent layer adhesion since the U shaped part is oriented such that the clamping force is trying to pull the layers apart. 

Assembly

Insert 6 M3 heatset inserts into each U shaped part.

Use

I move the X carriage to about the center of the rail. Take one of the U shaped pieces and place it to the right of the X carriage. Fasten the "Belt Holder Mid" piece to the U shaped piece using the 4 corner screw holes and 4 M3 x 12mm bolts. This piece should have the recessed slots facing towards you. Adjust the clamp so it is touching the X carriage. Do the same for the second clamp on the left side of the carriage. Now the carriage will not move. For a VORON StealthBurner toolhead mount the clearance works so the clamps do not interfere with the toolhead. For other toolheads you may need to leave space between the clamps and the carriage to clear the toolhead mount.

Now take the "Belt Grip" pieces and use 2 M3 x 18mm bolts on each to loosely fasten them to the clamps with the grippy things facing away from you so they can clamp belts that are in the recessed slots. Loosen the belt tensioners as much as practical. Thread the belts between the two plates and adjust the belts as needed. You can adjust the belt grip bolts to allow you to pull the belts back and forth with a little effort but not move after you let go. You should be able to ensure that belts that are the same length are aligned properly by lining them up the ends vertically on the carriage. When you have the belts position correctly, tighten the 18mm bolts and everything should be very firmly fasten in place. At this point it is a good idea to apply tension to the belts to ensure everything looks good. If you cannot get tension on the belts they may be too long and you will have to cut and readjust.

Now you can install the toolhead--the belts should just hang out right where you want them. No need for a 3rd (or 4th!) hand. After the toolhead is installed you can remove all the bolts on the clamps and everything should be good to go!

CAD Files

I used onshape to revise and design these parts. If you want to tweak them or look at them and have an onshape account you can find the files here. A STEP file containing all the models is also present in the downloads.

Revisions

2026-08-07 Added STEP file with all the models.