u/OrangeTungsten

I want to share a side project I’ve been working on. It is a lightweight, web-based tool that allows you to generate a 3D terrains directly in your browser, without need for any heavy 3D software. Generated models can be converted into XYZ numerical heightmaps, for later loading in same or different software.

Currently working on stl and image export (bw heightmap).

It comes useful when you need fast modeling with numerical output.

The code is fully available on GitHub. Take a look!

I'm very happy how it turned out, although this time soldermask has some small bubbles, probably because surface was not clean enough, or lamination temperature was too high.

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You have parameters below

TLDR; Photoresistive film with SLA exposing method before etching, photomask method for soldermask. Exposing is done via SLA 3D printer. Basicly, you put PCB clad with unexposed uv sensitive film directly on screen of SLA 3D printer and load positive image for 20 seconds. The same results you can acheive using photomask and regular UV lamp. Soldermask is done using dry film Dynamask 5000, aplying photomask prior to UV exposing on regular UV lamp (not SLA method) All the details are below.

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Exposure

Method: Photolithography on dry UV-sensitive film
UV film warm laminated on clean copper layer
Exposure method: Direct imaging using monochrome Stereolithography LCD
Device: Anycubic Photon Mono M5s Pro
Display type: Monochrome 10.1" LCD, UV light @ 405 nm
Image used: Positive STL model of PCB traces
Exposure mode: Single-frame light exposure
Exposure time: 20 seconds

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Developing

Solution: 1 mass% Na2Co3
Temperature: 25 °C
Agitation: Light scrubbing with soft brush

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Etching

Solution: 40 mass% FeCl3 | pH = 1
Temperature 55 °C
Agitation: Horizontal cyclical motion with 80 strokes/min

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Soldermask

Method: Dry-film UV curing soldermask
Soldermask type: Dynamask 5000 | Warm laminated on clean copper layer
Photomask: Positive image of soldermaks-free positions
Photomask material: OHP transparent foil | thickness = 100 um
Printer: HP MFP-178 | HQ BW mode
UV lamp: 4x 9 W U-Shaped UV bulbs @ 365 nm
Exposure time: 20 s
Developing: Same as PCB UV film | 1 mass% Na2Co3 @ 25 °C and light scrubbing with soft brush
Final exposure time: 30 min

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