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Rotary Add On Wheel for OM Tech Rotary

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Plastic Spider Designs

 Product Description

This is an add on Wheel for the OM Tech Rotary that will hold Tumblers, Cups and Glasses down so they do not jump or move when being engraved.  See video below to see it in action.

Note that this is a DIY Installation onto your OM Tech Rotary.  This may work with other rotary's but has not been tested.  The arm extends into tumblers and cups about 80mm.  
You may find it necessary to shorten the arm if you are working with cups that are very shallow.  I have used 20 and 30 ounce JDS Tumblers and 20 oz RTIC tumblers without issue.

This comes with the following parts.

  • Qty 1 - 3D printed based (printed with PLA Plus)
  • Qty 1 - Arm which contains Bearing, 2mm X 100mm Stainless Rod, Wheel & Arm (printed with Flexible TPU)
  • Qty 1 - Retaining Plate (CNC Machined from 1.5mm G10)
  • Qty 1 - Screw to hold arm (M3 X 18mm Screw, 2 M3 washers, 1 M3 Nylock Nut)
  • Qty 2 - Screws to hold base to Rotary (2 M3 X 12mm Screws, 4 M3 Washers, 2 M3 Nylock Nuts)
  • Qty 10 - Size 8 Rubber Bands


  1. Align base on top of the Stepper/Gear housing and center it so the wheel is centered between the wheels.
  2. Use something to mark the aluminum housing for the location of the 2 holes.
  3. Use a punch to set location to drill holes.
  4. Drill the 2 holes with a 1/8" or 3mm drill bit..  The screws are M3 size.  Be careful not to drill into the belt as the holes are very close to where the belt is.  
  5. Mount the Base using the 2 M3 screws and nuts provided.  Be careful not to drop the nuts or washers.  I found it easiest to turn the rotary on its side.
  6. This completes the installation.  When you place a cup or tumbler on your rotary you should make sure they stay aligned before doing your engraving.  Simply spin your Y Axis.


Video of 20 OZ JDS Tumbler spinning on Y Axis at 300mm per second to show that the tumbler will not jump around.

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