Triple Water Block

This is water block and hot end mount for RoStock type 3D printers. I designed it to be made without a CNC mill using printed parts as guides. If you have a CNC mill then use it (and feel free to make me one too;). Thought of calling it a cricket (but that isn't really a 6 legged monster;).

3D printer parts and enhancements

Creative Commons Attribution Share Alike

Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags


Water block for a triple hot end RoStock printer.  I have been working on this for quite a while (before the Kracken was released actually).  Fitting 4 extruders on the RoStock platform is difficult and isn't radially symmetric.   The benefit of using water cooling is that it takes less space and allows rigid alignment of the hot ends to each other... its also sounds better to have a water-cooled 3D printer;)  
I designed this to fit on the standard RoStock platform so all the holes should line up.  I have been using this in a dual head setup for a while, I will eventually move to triple head when needed and after getting everything else setup.

Instructions1. Print out the two drill guides  2. Clamp the first one onto the Aluminum bar stock so as to waste as little material as possible  3. Use a countersink/Center with a 3/8" wide head to locate the center hole location.  Don't just stick a drill bit in there it will wander and your locations will be all messed up... and your drill guide will be destroyed.  
4.  Remove the guide, drill the hole at 5/16" and use a bolt or some threaded rod or a bolt to clamp the guide to the bar stock.
5.  Now with the guide held with one hole use the center on one other 5/16" holes.  Remove the guide, drill the hole through and clamp with two bolts.  Now the other two holes can be safely located with the center without any worry of wander.
6.  For the smaller holes use a 3mm drill bit tip to mark the locations (or a 3mm/0.125" center if you have one).  7. Use the outer edge of the guide to trace the shape of the block  8. Remove the drill guide and drill through the large holes with a 5/16 drill bit.  Drill out the smaller holes to 2.5mm to prepare it for tapping at M3 9.  Now the fun part, use a hacksaw to cut out the piece from stock making the flats a priority for accuracy.  10.  If you have a lathe you can mount it to round out the piece or try an afgan lathe... 11.  Clamp the other drill guide around a side and once again use the center to locate the side holes 12. Drill the large holes at 11/32" to prepare them for tapping, be careful to not go too far but also be sure they connect with each other.  It may take a few tries, just be conservative at first.  13.  Tap the small mounting holes, and set screw holes M3  14.  Attach the fittings and tubing (note screw in fittings without extensions first (couldn't find swivel elbows at this size.

I went through a few iterations, an alternative/previous design used a slightly different hot end and was held in place with a nut on the top and bottom of the water block.  This worked pretty well but was a little more cumbersome to adjust the height and required a longer cold end meaning more weight and challenge in drilling the 4mm center hole.  The idea of using the set screws I took from the design of the Kracken (E3D).  

Materials and methods


- Drill press (highly recommended over hand drill)

- 3/8 drill bit

- 5/16 drill bit

- 11/32 drill bit

- 2.5mm drill bit

- 1/8 NPT tap

- M3 tap

- 3/8 center

- 1/8" center

- Hacksaw


- Aluminum block 1/2" x 2.5"x 3+"

- 6 x 1/8NPT to 3/8ID tubing elbow 463K498

- 3 x 1/8NPT Male to female extender 50785K25

- 3/8 tubing



Issues are used to track todos, bugs or requests. To get started, you could create an issue.


C46ad9bb6ee16c259628372f7d8fcd53?default=blank&size=40mikefazz commented ago

Yeah I have a new version with an outer perimeter channel and other features, much improved just haven't documented it yet.

Mini lisca mangaLisca commented ago

You could dril the inner connections in the block and then close them with plugs saves pipes and weight.

In the end just one way in and one out.

C46ad9bb6ee16c259628372f7d8fcd53?default=blank&size=40mikefazz published this design ago