V2 Magnetic Injection Assistant for Insulin / GLP-1 / TRT

New and Improved for V2:

Injecting myself makes me anxious.  This device takes away most of the stress by giving me an ergonomic grip on the syringe and automating the injection motion with magnets.

After adding the syringe, push up the sled until the embedded magnets snap it into place.  While holding the guide against your skin, push down gently on the actuator and the sled will smoothly jump to the lower set of magnets while inserting the needle.  The syringe plunger will be within easy reach without adjusting your grip.

What's NEW?

• Significantly reduced sliding friction thanks to new filament rails and improved tolerances

• Simplified hardware needs: now just one type of screw and fewer magnets

• Longer travel and streamlined options - 2 sizes (down from 3 in v1) with no downsides or loss of compatibility

• Simplified assembly and perfected tolerances.

• Dozens of other small tweaks and improvements

Compatibility:

Pick a body based on needle length and desired injection angle:

• Standard Height body is compatible with 5mm, 8mm, 12.7mm,  or 16mm needles 

• “Tall” body supports longer needles up to 1.5" or 38mm

Syringe adapters available:

• 0.3ml U-100 syringes

• 0.5ml U-100 syringes

• 1ml U-100 syringes

• 1ml Luer Lock syringes

• 2ml BD Emerald Luer Slip syringes

• 3ml Luer Lock syringes

Common uses are Insulin, GLP-1 (Semaglutide / Tirzepatide), TRT (testosterone / hormone replacement therapy), or B-12 injections.

Printing and assembly:

Total assembly takes less than 5 minutes.  All magnets are press-fit and shouldn't need any glue

1. Print all parts as oriented in the files. You will need:

   1. One Body (depending on the length of the needles you use and straight or 45° angle)

   2. One Sled

   3. One Syringe Adapter

   4. One Plunger

   5. (optional) PTFE cutting jig

2. Sled Assembly:

   1. Press in 3 magnets.  2 on the rear and 1 on the bottom. (take care that all three magnets polarity are facing the same direction)

   2. Align PTFE with the slots on the side and press in.  You can insert it while long and then cut flush with the top after OR pre-cut with the PTFE Cutting Jig.

   3. Attach the Syringe Adapter using 2 M3x6mm screws

   4. Attach the Plunger to the top of the sled using the last M3x6mm screw.

3. Body Assembly:

   1. Press in 2 magnets.  The polarity should be aligned so both are attracted to corresponding magnets on the sled

      1. TIP: To easily insert the bottom magnet with the correct orientation, attach an extra magnet to the bottom of the sled, then insert the sled into the body and press down.  It will align and press in the magnet for you.

   2. Add 2 short lengths of filament to the back rail.  You can insert them fully then just cut them flush at the top.

   3. Insert the sled from the top.  It should slide smoothly with no interference.  If your magnets are oriented correctly, you'll feel it stop when the sled is flush with the top of the shell.

Assembly Video walkthrough:

You're done!

BOM / You will need:

• 3  X  M3x6mm screws 

• 5  X  6x3mm magnets

  • Generic magnets (typically N35) work great for the standard height: https://a.co/d/05frdZyH.  For the taller heights when used with long needles I have a small preference for upgrading to stronger N48 magnets: https://a.co/d/06sPYik6 .  I don't like the feel of the stronger magnets on the standard height - but feel free to mix and match for whatever your preference is.

• about 4" / 100mm of 2mm ID / 4mm OD PTFE Teflon tube ( https://a.co/d/3ThyJNc )

• 2 short pieces of filament (something slippery - doesn't matter much beyond that it's smooth)