Gaggia Classic | Pro Scales

This assembly is for adding scales to your Gaggia Classic or Gaggia Classic Pro. Compatible with two HX711 boards or Vas' dual HX711 board. Requires 750 g load cells.

Please use the assembly instructions at gaggiuino.github.io --------------------------------------------------------------------------

Print Instructions:

Print all parts in “Base” folder. Note that you need 2 Flex Limiters and 2 Load Plates.

There are 5 main drip tray options. Any of them will work with the scale base, pick one:

- GC Drip Tray : GC Drip Tray Adapter and 4 Drip Tray Spacers

- GCP Drip Tray : GCP Drip Tray Adapter (L and R)

- Low Profile 3D Print DripTray (no other adapters needed) Note: Recommend printing the _testSupport model and verifying quality before printing the 3D Print DripTray LP. Also, ensure excellent bed adhesion to avoid warp at the edges.

- Low-Profile Drip Tray : LP Drip Tray Adapter and 4 Drip Tray Spacers Note: designed for BaristaGadgets and Shades of Coffee (Pre 2019) low profile trays (may be compatible with others, but unconfirmed)

- 3D Print DripTray / LP (no other adapters needed) Note: not recommended unless your stock tray is broken

Flat first layers are essential because clearances are so small. If you have flow issues such as elephant's foot please calibrate flow before printing or parts (magnets, load cells) may not fit.

Print settings: PETG, 0.2 mm layer height, 0.4 mm nozzle, no support, 20% gyroid infill. 3-4 wall lines recommended for GCP drip tray adapters. Print orientations per model.

Printing notes: Minimum print area is 150x150 mm The GC and LP drip tray adapters need a print area of 200x130 mm. Split models that only need 130x130 mm are available in the “Drip Tray Adapters - Split” folder. Print so that the axes remain consistent (don't rotate parts from the orientation they will be assembled in).

Split parts intentionally have slip-fit tolerances to eliminate stress and warp in them post-assembly. Use gap-fill cyanoacrylate on the interface and clamp flat to assemble.

3D print drip tray requires 200x130 mm print area. A thin coat of epoxy resin / clear coat will help make it waterproof if your print has slight gaps left.

Hardware needed:

- M3 Flat head screws

- 2 M3x5 mm nickel plated steel (must be magnetic)

- https://www.aliexpress.com/item/3256803315929210.html

- 6 M3x5 mm and 4 M3x4 mm (non-magnetic stainless steel)

- https://www.aliexpress.com/item/2251832760640149.html

- 2 thread-rolling/self-tapping screws for plastic (multiple options, pick one)

- M3x6mm self-tapping screws for plastic

- https://www.aliexpress.com/item/3256802230982244.html

- #4-20x1/4" thread rolling screws (local USA option)

- M2.9x6.5mm self-tapping screws for plastic (local EU option)

- 20 disc magnets, 5 mm dia. x 2 mm ht.

- https://www.aliexpress.com/item/3256803930463196.html Note: Most machine housings are magnetic - you only need 12 magnets if yours is not. The scales will still work but won't be held as securely.

- Gap-filling cyanoacrylate (super glue)

- 2+ 750 g load cells

- https://www.aliexpress.com/item/2251832483911236.html Note: Buying 3-4 load cells is recommended as QC isn't great and they may need modifications that can result in damage if done improperly

- HX711 interface board(s)

- https://www.aliexpress.com/item/2251832855509243.html

- 2 AliExpress HX711 boards OR Note: you may want to buy 3 as some people find them tricky to solder

- 1 custom dual-HX711 board from the Gaggiuino project

- 1 row 2.54 mm right angle (reverse bending) header pins (only need 5 pins)

- https://www.aliexpress.com/item/2255800474074961.html

- 1 5P JST XH or DuPont connector

- https://www.aliexpress.com/item/2255799940249067.html

- 1 Stripboard/protoboard (only need a small piece)