Ultimate Ice Cream Machine

prusaprinters

<h3><strong>Printing and assembly</strong></h3><p>I used 4 perimeters and 10% gyroid infill but 3 perimeters would be enough.&nbsp; I printed from white Verbatim PLA and it still works surprisingly well. It didn't break even in -18°C after 6+ hours. I use N20<strong> 30 RPM DC motor</strong> to propel the UICM but I am sure other motors with the same dimensions and similar RPM will work too.</p><p><strong>uicm-stator&nbsp;</strong>is the only part that needs supports. I used PrusaSlicer drawn supports for four holes and drawn supports blocker for the little groove under the motor mount because bridging can easily print over it.&nbsp;<strong>You only need one part</strong>. After printing remove all supports and smooth support contact places with sandpaper.</p><p><strong>uicm-rotor&nbsp;</strong>doesn't need supports if your printer can print average bridging. You only have to rotate the model so the gear is at the top. I recommend turning off the supports because it's extremely complicated to remove them.&nbsp;<strong>You have to print two of these parts</strong>.</p><p><strong>uicm-motor_gear&nbsp;</strong>is the simplest part to print and I think everyone can make this right. I only recommend using 15% infill for better results.&nbsp;<strong>You only need one part</strong>.</p><p><strong>uicm-axis&nbsp;</strong>is also quite easy to print.&nbsp;<strong>You have to print 4 of them&nbsp;</strong>but you will probably have to print more because even a little bubble or any layer inconsistency in one of four legs usually leads to failure and breaking of this part. Also prepare for a lot of stringing even on a well calibrated printer.</p><p>After you have all parts ready for assembly, solder some longer wires to your motor. They should be at least 0.5m long because you must keep your power source outside of the freezer. I used two 0.8m long wires with a diameter around 1mm. After soldering, isolate all exposed metal parts on your wires with a hot glue gun. Cover with it everything well because in the freezer water condensates faster on metal parts and it can short the circuit. Then just put 3D printed motor gear on motor shaft and attach the whole motor assembly to the motor holder in uicm-stator part with two small zip ties. After that, just put in two uicm-rotor parts so the gears link with motor gear and fix them with 4 uicm-axis parts. I powered the whole thing with two AA batteries because it's the easiest option for me.</p><p>I have uploaded&nbsp;<strong>.stp .ipt and .f3d files</strong> if someone wants to make remix for different motor.</p><h3><strong>Freezing</strong></h3><p>First you have to pick a jar. I designed the UICM for all jars with a diameter between 60mm and 90mm but I also tried it with a 120mm jar and it worked perfectly and I am sure it can work even with a jar with 150mm diameter. Only limits are that the jar can be&nbsp;<strong>maximally 168mm tall and must be perfectly round.</strong></p><p>Before you put ice cream in the jar and freeze it, check if the lid and jar thread are intact because even a small bend or chipped glass can cause leaking and catastrophe in your freezer. Simply check it by filling the jar with water and then tightly close it and lay it on a side in the kitchen sink. Leave the jar like this for half an hour and then check if it’s not leaking. If it’s dry you can fill it with ice cream mix.</p><p><strong>Never fill the jar to the top, fill it only to&nbsp; ¾ of its volume</strong> otherwise the expanding ice cream can break the glass or lift the lid and start leaking. Also before closing the jar, dry&nbsp;<strong>the lid and jar thread</strong>, it prevents leaking. Then when you double check everything you can put ice cream&nbsp; in a jar inside the freezer. Put it on your UICM so the lid will be on the other side than the motor (it is easier to clean if something goes wrong). Make sure you have UICM well leveled inside the freezer because when it spins the jar can slowly slide to one side and get stuck or fall out.</p><p>You are done with freezing when the jar is not moving but it's slipping on UICM. It will have consistency similar to soft serve because the purpose of ice cream machines is to break forming ice crystals and aerate the ice cream mixture but they can't make solid ice cream. You can store the ice cream inside the freezer in a jar in which you make it or any box that can be sealed. It should be safe to store it for a few weeks. Just before eating leave it outside the freezer for 5 minutes to let it soften.</p><h3><strong>Ice cream recipes</strong></h3><h5><strong>Coffee ice cream</strong></h5><p><i><strong>Ingredients</strong></i><strong>:&nbsp;</strong>whipping cream - 500ml, instant coffee - 2tbsp, sweet condensed milk - 160g</p><p>Mix everything together with whisk until coffee and condensed milk completely dissolve in cream. Taste it and add condensed milk if you want it more sweet or add more coffee if you want stronger coffee taste etc. and then mix it again. I also like to add some milk (around 100ml) to make the ice cream a little bit lighter. When you are happy with your proto-ice cream just pour it in a jar and freeze it according to the&nbsp;<strong>Freezing&nbsp;</strong>part written above.</p><figure class="image"><img src="https://media.printables.com/media/prints/269224/rich_content/dab3581f-55b1-4d47-aa7e-654e904f8ed6/img_0992.jpg#%7B%22uuid%22%3A%227bc9e8ef-8d43-4cb5-b2a1-17b230e95529%22%2C%22w%22%3A6000%2C%22h%22%3A4000%7D"></figure><blockquote><p>Ice cream from UICM after 2 hours and 32 minutes (left) vs from Klarstein Vanilla Sky after 33 minutes (right).</p></blockquote><h5><strong>Nutella ice cream</strong></h5><p><i><strong>Ingredients</strong></i><strong>:</strong> milk - 600ml, whipping cream - 400ml, Nutella (or any similar hazelnut spread) - 330g, Dutch-style cocoa - 50g</p><p>Mix everything together well with whisk until Nutella and cocoa completely dissolve in cream and milk. Taste it and add more Nutella if you want it more sweet or add more cocoa if you want stronger cocoa taste etc. When you are happy with your proto-ice cream just pour it in a jar and freeze it according to the&nbsp;<strong>Freezing&nbsp;</strong>part written above.</p><figure class="image"><img src="https://media.printables.com/media/prints/269224/rich_content/1d71e3fa-8e6c-4213-9c17-840941f47864/img_1132.jpg#%7B%22uuid%22%3A%22c553d6d1-70a3-4da8-981e-185277e921d4%22%2C%22w%22%3A6000%2C%22h%22%3A4000%7D"></figure><blockquote><p><i>Nutella&nbsp;i</i>ce cream from UICM after 2 hours and 21 minutes (left) vs ice cream from Klarstein Vanilla Sky after 26 minutes (right).</p></blockquote>