Slot cutting jig for model rocket building (BT-80 Estes/LOC 3 and 4 inch body tubes)

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This jig will make it easy to cut 3 or 4 slots 1/8 inch wide in a BT-80, Estes Pro Series 3 and 4, and LOC 3 and 4 inch tubes so you can have through the wall fins.  If a wider slot is needed, you can cut a second set side by side the first one to expand the width.  Likewise you can use it repeatedly if you need 6 or 8 slots.

The markings that go around the tube indicate each 1/8 inch and are 0.4mm wide, so print the tower part with a layer height of 0.20 for best results.  Supports should not be needed.  I recommend a material like PLA+ or stronger.

To use the jig do the following:

• Insert tube into the tower 
• Use some painter's tape at the top to hold it in place from rotating
• Slip the rings over the tower and position them to mark the top and bottom points for the slot using the built-in ruler and measure markings (Note: if the ring is upside down it will not fit over the tower)
• Use a binder clip over the tabs on the ring to hold the ring closed and in place
• Use a very sharp knife to cut out the slots you want.  Multiple passes with light pressure is recommended.  Markings on the base of the tower indicate where slots go for 3 slot or 4 slot arrangements.

the Estes Pro Series 4 tube and the LOC 4 inch tube are similar enough that the same jig should work for both.  Please let me know if any adjustments need to be made.