RV roof vent crank knob

Replacement knob for a vent crank that cracked

Score62Worth testingPer print hour$3.33OkayCompetitionFew sellers
Sells for $6 to $12 Idea to test

The numbers

Sells for$6 to $12
Print time0.8 to 1.3 h
Filament15 to 25 g
Cost per item$4.19
Marketplace fees$1.31
Left per sale$3.50
Per print hour$3.33
Demand (niche)Medium
CompetitionLow
Legal and licence riskLow
EvidenceIdea to test

Estimates for one item at the middle of the price range, after filament, power, machine wear, marketplace fees and your time at $15 an hour. Shipping not included. Not sales data.

How the score adds up

Profit per print hour10/30
Demand15/25
Low competition20/20
Low legal risk15/15
Evidence quality2/10

Demand and legal risk come from the niche RV discontinued clips and latches. An idea to test can score 69 at most until someone has seen it for sale.

Why it can work

  • Few sellers compared with other products
  • Low brand or licence risk if the design is your own
  • Seasonal demand: Spring preparation and summer travel

Why it might fail

  • Thin public evidence, so treat these numbers with care

Be aware before you sell

Own-measured parts are safest, and shared files still need a licence check. Functional replacement parts are usually low risk, but avoid maker logos and check for live design patents. Etsy asks for your own original design, so a licensed file may not qualify.

Check your versionRun your own numbers

Other products in this niche

63RV drawer catch clip61RV cabinet push latch60Camper curtain rod bracket

See the whole niche: RV discontinued clips and latches

Check your own idea before you print 50

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