Original Prusa i3 MK2 Z-Axis Clip on Fan Mount
Description
After Doing My First 8+ Hour Print, I Noticed How Hot The Stepper Motors Were. I Found Several Great Examples For Mounting 40Mm Fans To The Nema 17 Stepper Motors. The Z-Axis Motors Still Get Plenty Of Workout And Get Plenty Warm, Especially On Objects With Lots Of Fine Details And/Or If You Are Printing At Higher Speeds. However, I Never Found Anything Specific To The Z-Axis Motors Found On The Original Prusa I3 Mk2. I Was Inspired By Other Designs, Mainly: Https://Www.Thingiverse.Com/Thing:1409754 -And- Https://Www.Thingiverse.Com/Thing:31405 ...But Neither Of These Would Fit The Z-Axis. The Original Prusa I3 Mk2 And Mk2S Both Have Unique Brackets That Hold The Z-Axis Stepper Motors, But At The Same Time These Same Brackets Prevent The Use Of Full Wrap Around Designs. My Goals For The Design Were Two Fold: 1. Design A Bracket That Would Mount Easily Without Having To Disassemble Any Of The Printer. Disassembly Could Result In Re-Calibration. No One Has Time For That. 2. Design A Bracket That Would Sufficiently Cool The Motor, But At The Same Time Deflect Air Down And Away From The Heated Print Bed. If I Had Designed A Simple Open Air Bracket, The Air Would Be Blasted Everywhere After Bouncing Off The Front Of The Stepper Motor. To Meet These Goals, This Fan Mount Is A Clip On Design That Simply Slides Around And Fits Neatly Resting It'S Weight On The Nema 17 Motor'S Own Grooves. The Walls Are Thin (1Mm) To Allow The Plastic To Flex And Fit Around The Motor And At The Same Time Provide Air Channels That Help Cool The Sides And Deflect Air Downwards. You Must Print Two Of These, One For Each Z-Axis Motor On The Original Prusa I3 Mk2. The Left And Right Side Motor Mounts Are Identical, So My Design Works On Both. The Screw Holes Are Sized To Fit M3 Screws And Will Self Thread Into The Plastic. Purchase Screws 5Mm Longer Than The Thickness Of Your Fan. For Example, To Mount A 40Mm X 20Mm Fan (Like The One In My Pictures), You Will Need M3 X 25Mm Screws. If Your Fan Has Countersunk Holes, Get 5Mm Shorter Screws. You Can Always Use A Small Washer To Help. If Your Screws Are Too Long, They Will Prevent The Mount From Fitting Onto The Motor Properly. Nuts And Lock Washers Are Not Necessary To Mount The Fan. If You Do Use Nuts, Take Care To Use Ones Thinner Than 5Mm. I Used The Recommended Settings For The Prusa'S Version Of Slic3R Included With The Printer. Specifically .15 Resolution, 20% Infill, And No Supports Or Rafts. Mine Are Printed In Pla, But Feel Free To Attempt To Print Them Using Other Materials. This Fan Mount May Work On Other Printers With Nema 17 Stepper Motors, But It Was Specifically Designed For The Original Prusa I3 Mk2 And Mk2S And I Do Not Guarantee Compatibility With Others. Prusa Has Recently Announced The Mk3 For Release Later This Year. Based On The Pictures, The Z-Axis Motor Mounts Appear Unchanged From The Mk2 Series, So I Strongly Suspect These Might Fit The Mk3 When It Comes Out. If It Doesn'T Fit The Mk3, Feel Free To Remix It.
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