My Printer has a Secret

The sheet offered two clues: yellow printer dots and an unusually colourful patch of triangles. The dots supplied an archive password; the triangles supplied its URL. Inside the archive waited an OSINT scavenger hunt.

Read the sheet

The yellow marks form repeated 15×15 grids like printer tracking dots. Treat the row and column marks as synchronization, then read the remaining dots as one bit stream: dot present = 0, dot absent = 1. Eight bits at a time produce:

sut0roberi1-fure!b4a_*=^

The triangles use eight colours, enough for three bits each. Reading them in order with this mapping reveals the archive address:

Colour	Bits	Colour	Bits
Red	000	Green	100
White	001	Blue	101
Purple	010	Yellow	110
Black	011	Orange	111

<ihttps://printer-secret.chals.tisc26.ctf.sg/Fn8u92fhuiWAfeAfGu23dy.zip
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The leading characters are noise; the https:// address is the useful part. The password-protected archive contains printer-secret-part2.txt, which turns the solve toward a deleted auction listing.

Follow the seller

The archive asks for the Flickr username behind auction d500233180, plus two details from the seller's online presence. A Gumpla post led to the seller's profile:

Another Yahoo auction listing connected that profile to a Flickr account and a model-hobby profile:

The Flickr username is abn2263123. The hobby profile banner shows grey pants, and the seller's shop features an MS-18E model.

Put the three answers together:

TISC{abn2263123_grey_MS-18E}