- 1 Makerslide Belt Clip
- 2 Shapeoko 3 belt clip
- 3 Washers
- 4 Kosme Belt Clamp
- 5 DrRob Belt Anchors
- 6 Zip ties for belt anchors
- 7 Tobs Belt Anchors
- 8 Friction fit belt anchors made of starboard
- 9 Eye Bolts
- 10 Plexiglass
- 11 Printed Belt Anchors
- 12 eShapeOko Belt Clamps
- 13 Electrical connectors as belt anchors
- 14 Inverting Belts
Makerslide Belt Clip
Please note that a new belt anchor design was created for future iterations. See Makerslide Belt Clip.
Some users have reported clearance difficulties (V-wheels stopped by new on-rail belt clips?), w/ BotDoc trimming his down. Catalin Voinescu addressed this by creating similar Buckle-type Belt Anchors which are narrow enough so as not to interfere.
Jacob32123 made narrower replacements using 0.02" aluminum: Narrow Belt Clip (includes SVG).
One concern is that the limit to the travel prevents the wheels on the underside of the X-Axis Carriage fouling on the wheels on the top of the Y-Axis, presenting a potential issue when full-travel is made possible on the X-axis.
Arrangement of the belt: http://docs.shapeoko.com/content/belt-routing/67-so_wiring-066.jpg 
Note that this has since been changed, the suggested technique now is:
- in from the bottom
- over the center bar
- down near the vertical connector
- back under
(basically just turn over the above image)
Shapeoko 3 belt clip
An L-shaped bracket w/ cutouts for the belt.
Further details at: http://docs.carbide3d.com/article/46-how-to-route-the-belts-for-the-x-and-y-axes or see the assembly instructions for the Shapeoko 3. Note that since Summer 2016 that the SO3 belt anchors now include a PEM nut for tensioning.
Note that routing is somewhat subject to user vagaries as one can see in the images for Tim Foreman’s limit switch kit: http://www.shapeoko.com/forum/viewtopic.php?f=12&t=6203#p48174 --- the exact routing doesn’t matter so much as ensuring that the belt is held tightly so that it doesn't move.
One option for addressing this is to move the clips to the outside of the end plates and pull the belt through: Re: V-wheels stopped by new on-rail belt clips?.
A further iteration would be to also add a bolt and nut as in Quick and easy Y-axis tensioners.
Created by: T4b
Upgrade Name: Washers
Description: Belt anchors made by only adding four big washers to the stuff already used for the default belt anchors.
Status: Fully functional
Materials: 4 big washers
The only non-obvious thing might be that to tension the belt further it's a really good idea to loosen the belt mount brackets a little, install the belts (tightly) and then tighten the belt mount brackets again.
Ideally, you would use washers a little bigger the ones I had lying around.
I guess it's quite similar to the zip ties method, but for some reason I like it better than zip ties.
Kosme Belt Clamp
Created by: User:Kosme
Upgrade Name: Kosme Belt Clamp
Description: Proposed belt clamp design
Status: NOT TESTED
Materials: 7mm UHMW or HDPE
Link to a proposed belt clamp design. It was designed in Sketchup and the gcode generated with Phlat Script. To use it, remove the current belt clamp and the two screws holding the rail to the end plate, put the screws through the holes in the new clamp and re-screw them to the rail. Run the belt between the two top holes and pinch it using the current belt clamp, two screws, and two nuts.
22/02/2012 New Gcode for rounded edge on 7mm thick T shaped clamp.
DrRob Belt Anchors
Created by: User:DrRob
Upgrade Name: DrRob Belt Anchors
Description: Belt anchors made from short right-angle aluminium strips
Status: Fully functional
Materials: Right-angle aluminium strips
Construction details can be found here: DrRob's belt anchors.
Burke LaShell - I used DrRob's idea with a flat aluminum strip on top. Works great!
John Cutbruth - I used DrRob's idea with but got 4 extra M5 Belt Anchors at hardware store for the top strip. very tight fit!
John Cutbruth - Here is a pic of the parts to build.
Hardware Store Alternative
In forum post Re: ShapeOko #200 from inventables batch user alpha suggested, "2 packs of corner braces from Lowes (Stanley S838-946 / DPB113 plus 10-32x1/2 combo round w/nut 10 Pcs) instead of fabricating my own".
Zip ties for belt anchors
One concern is that zip ties may be adversely affected by heat, or heating up caused by direct sunlight.
Created by: User:potatotron
Upgrade Name: Zip ties for belt anchors
Description: Proposed belt clamp design
Materials: Zip ties
I used zip ties to secure the belts and it seems to be reasonably strong and since the belt's teeth are holding itself in place I don't think it will slip. I loosened my belt mount brackets, did the zip ties and then tightened down the brackets to add some good tension to the belt.
aliekens - I successfully used this extremely simple idea too.
Triggs - Another implementation of the zip tie Anchor.
WillAdams - A big help for zip ties is to cut a short round dowel in half and place the zip ties around them and the belts like a sandwich --- I also use that with eye bolts as mentioned below. Might be better to do this w/ mini hose (screw) clamps instead --- #4 seems about the right size.
An alternate technique using two different sizes of zip ties, allowing for on-going adjustment is shown here in this forum post: Cat's ShapeOko (#709)
Another technique is to run the belt through the hole, around some round object or peg and then back along itself. This can be extended so as to help hold the machine together as seen in: Wfa_shapeoko_ziptie_cable-mgmnt_mk-iii.JPG
Tobs Belt Anchors
Created by: User:Tobs
Upgrade Name: Tobs Belt Anchors
Description: Belt anchors made from two pieces of aluminium
Materials: 25mm wide and 8mm thick aluminium bar (cut into pieces of 70mm and 10mm)
Each belt anchor consists of two aluminium parts, a small clamping part (A) and a larger part to mount on the machine (B) (see drawing below). The holes on part (A) are normal holes, whereas the ones on the top of part (B) are threaded to fit an M5 screw. In addition, four M5 x 16 screws are needed. Two to mount the belt between the two parts and two to mount everything to the machine.
Friction fit belt anchors made of starboard
Shown on the forum post Re: Another Red Shapeoko. Next post down includes G-code to cut out of 12.7mm (half inch) material.
Another friction fit design is shown in HTD3M belt-tensioner.
Forum member bubblehead "...used an eye bolt to adjust tension. I'll probably add a locking nut so it doesn't loosen." Re: Belt anchor with adjustable tension
A 3/16" x 1-1/2" eye bolt (rated at 65 lbs.) seems a good fit (~$1.39 ea. @ True Value). Add a wing nut and washers (at least one locking washer) for easier adjustment.
N.B. - only one eye bolt is needed per belt --- position it at the end where it will least affect the gantry.
Forum user microwavesafe moved his Belt on outside.
Printed Belt Anchors
A number of designs for this have been uploaded to Thingiverse:
- Shapeoko Belt Clamp
- shapeoko outside belt clamp
- HTD3M belt tensioner for ShapeOko
- ShapeOko Belt Tensioner
- shapeoko X axis belt clamp
- Parametric Timing Belt Clamp --- designed for use with open end plates to allow inverted belts on the outside.
- http://www.thingiverse.com/thing:50513 --- belt clamps w/ tensioning system
And others to the forums:
- 3D Printed Belt Clamps by drs29
- Re: Just Enlarged my Shapeoko with some UpGrades --- diagram on Photobucket
eShapeOko Belt Clamps
A Belt Clamp Set is available from MakerSlide Europe, SU010
Electrical connectors as belt anchors
Forum user xtonyx found these Blackburn #2/0 Stranded Max Type-ADR 2-Conductor 1-Hole Mount Dual-Rated Wire Connectors (2-Pack) at Home Depot and decided to use them for belt anchors in his machine: Tony's ShapeOko #1894F.
Cpt Kirk's - Hacked shapeoko - Build Log --- shows two different options.
A frequent additional change when altering belt placement is to turn them over to keep debris out of the teeth: Another Belt Configuration