3D模型中的流动过滤器

Flowtafilter

2024-03-14 21:09:52

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Summary

The Flowtafilter is an analytical tool to measure the flow distribution coming from an espresso machine grouphead. Water flow from the group is collected in four catchments, and the output of each can be separately measured. Since the surface area of each catchment is equal, water flux through each is also expected to be equal. The inside bottom surface is sloped 10 deg to aid in drainage, but also to allow for experiments tilting the machine by as much as 10 deg. There is enough room within the tool to fit a 1.7 mm puck screen.

The Flowtafilter can be used to simulate the preinfusion conditions of espresso brewing, namely before the headspace is filled with water and before pressure is generated (i.e. it's used empty without ground coffee). However this can be helpful to analyze flow distribution through dispersion blocks, shower screens, and puck screens.

Warning - Please make sure that your espresso machine is able to keep the grouphead temperature safely below the glass transition temperature for the filament used. For example the Decent espresso machine DE1 is able to control both the brew and grouphead temperature, which were both kept at 37C for all my trials. This is below the glass transition temperature of PETG (65C). Don't melt your print to your espresso machine!

Post-Printing

Printing and Assembly

Print the all three parts right side up (i.e. flip the prints from the default orientation). Support may be required for the lip under the lugs and the holes under the filter body.

To assemble, use CA glue to affix the nipples to the filter body and then the lugs to the filter body. To help make the filter water tight, I sprayed 3 layers of polyurethane inside the filter. Also it may be helpful to run a bead of silicone caulk on the inside seam between the filter body and lugs.

Attach 5mm ID silicone tubing to the nipples and secure with either silicone cauk or zip ties (or both).