Botgrinder Grinderino 3.5 inch Freestyle Frame from Ummagawd

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  • Regular price $44.95
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UPDATED* Botgrinder Grinderino 3.5 inch Freestyle Frame

Introducing the Grinderino.

If you love your Demibot, but wish you had one that's juuuust a little smaller, your wishes have been granted!

When Botgrinder asked if we can make him a 3.5" frame, he said he wants something just as good as the Demibot but in a smaller package. It took a bit of adjustment, but I think we hit the mark. As for flight controllers, this frame will fit a single board whoop style AIO, or a 20 x 20 stack. The rear of the frame provides plenty of space to fit a VTX of your choice, and just the same, the front will accommodate any camera. 

And if you were curious... Yes, this is less than 250g all up weight!

UPDATE: The Grinderino arms are now compatible with 9x9mm motor mounting!


  • Arms: 4mm
  • Top Plate: 2mm
  • Bottom Plate: 2mm
  • Mid Plate: 2mm
  • Standoffs: 6mm OD 7075 Aluminum
  • FC Mounting: 20x20 and 25.5x25.5 (whoop style)
  • VTX Mounting: 20x20 and 25.5x25.5 (whoop style)
  • Frame Weight: 65g
  • Motor Mounting Pattern: 12mm x 12mm and 9mm x 9mm

Frame Kit Includes:

  • 1x Top Plate
  • 2x Arms
  • 1x  Bottom Plate
  • 1x Mid Plate (with press nuts)
  • 1x Hardware Kit
  • 1x Ummagrip Battery Pad
  • 2x Battery Straps
  • 1x Set of TPU FPV Camera Mounts


Grinderino Assembly Guide

Full Print Sets includes Skids, FPV camera mount, chin bumper, and a tail to fit your VTX and RX antennas, leave a note specifying or I'll assume 03 and Immortal T.

    I'm also offering 2 varieties of skidz for this frame, the regular skidz and the LED Track skidz with a 4mm channel built in to protect the LED's and your carbon fiber!  Just leave a note with the TPU color if ordering skidz.

    If you want a GoPro Mount, let me know the model of your action camera, the angle you want it tilted, with or without ND filter slot, Rugged or Skull mount, and the color TPU in the notes!



    Parts List:

    DJI 03 Air Unit

    or Caddx Vista


    T-Motor Pacer 1604 3800KV Motors

    T-Motor F7 AIO 35Amps

    Crossfire NanoRX



    ELRS RadioMaster RP-1

    ViFly Buzzer

    2x Kevlar Lipo Straps

    CNHL Pizza 4S 600mah

    Gemfan Hurricane 3630