The SlapMake Blog

Guides and ideas for designing your own merch: AI artwork, print-ready files, and getting a design from your head onto a shirt, mug or poster.

A 2027 wall calendar open on January with a painted snowy cabin and weeks starting on Monday, beside six more month pictures
GuideLatest

How to Make a Custom 2027 Wall Calendar from Your Own Photos or AI Art

Make a 2027 wall calendar with a different photo or AI picture on every month, check each page is sharp, and order a single copy. Step by step, with real screenshots.

7 min read
Read the guide
A man in a sport gray crewneck sweatshirt and a woman in a black one, both printed with a round retro badge reading SELF MADE over orange and teal mountains
Guide

How to Make a Self Made Sweatshirt: Design It and Order One

Make your own custom sweatshirt or hoodie: design the artwork with AI or your own image, remove the background, place it on a Gildan crewneck and order a single piece. Step by step, with screenshots.

7 min read
The same cartoon design twice: blocky and pixelated at 68 DPI, and sharp at 300 DPI
Printing

Best DPI and Upscaling Settings for Midjourney and AI T-Shirt Prints

How many pixels an AI image needs to print sharp on a shirt, which Midjourney settings to choose, and how far to upscale a 1024 pixel image for a full front print.

6 min read
A star design on black fabric twice: with a pale halo around it, and clean after the faint pixels were removed
Printing

How to Fix White Halos Around Transparent PNGs on Dark Hoodies

Why a design prints with a pale outline or haze on a dark shirt or hoodie, how to find the invisible pixels that cause it, and how to clean the file for free before you order.

5 min read
Bright screen colors next to the softer versions standard inks print, in a row of swatches
Printing

RGB vs CMYK for Print on Demand: How to Keep Bright Colors on Custom Merch

What RGB and CMYK mean, why you should not convert your file to CMYK for print on demand, which colors change in print, and how to keep a design bright on shirts and hoodies.

6 min read
A neon sunset over a glowing grid, split into how it looks on screen and the duller version standard inks would print
Printing

Why AI Art Prints Look Dull or Dark (RGB vs CMYK Fix + Free Checker)

Did your Midjourney or AI shirt print come out dull and muddy? See why neon RGB screen colors shift in CMYK ink, and test your file free before printing.

8 min read
A folded gray t-shirt printed with a cartoon cat in sunglasses and tagged 1 of 1, next to a phone, ribbons and confetti
Creators

Custom merch for an Instagram giveaway: one piece, no minimum

A giveaway prize idea for small Instagram creators: turn your own post into a one-off custom t-shirt, mug or sticker, with no minimum order, shipped straight to the winner.

7 min read
The SlapMake studio with a neon tiger design on a gray t-shirt
Guide

How to design and print your own merch with SlapMake

A complete guide to the SlapMake studio: generate artwork with AI, edit it in a layered 2D editor, check it is print-ready, put it on a shirt, mug or poster, and order it.

10 min read
Design it. Slap it on anything.

The studio opens straight onto a canvas. No account or card needed to start.

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