Methodology
Deal3D compares prices for 3D printers, lasers and CNC routers from over 300 shops. This page explains how we collect and rate the data.
Where prices come from
Our crawler regularly fetches the shops' product pages and stores the displayed price and currency. Foreign currencies are converted to euros once, using the ECB reference rate of that day. We review conspicuous outliers manually before they count.
Which offers count
An offer counts only if it is in stock, priced above €0, the shop is active, the page is reachable and the price was checked within the last 7 days. A device's current price is the cheapest such offer. Without one, we show no price.
Price history
Each day counts at its lowest valid price. Days without a valid offer stay gaps in the chart; we neither carry prices forward nor interpolate. The default range is 365 days.
When a price is a deal
A deal is a new price: at least 5% below the median of the last 90 days, reached within the last 14 days, with at least 30 days of price data. A low price that has been stable for months is not a deal. A price below 50% of the median is treated as a mismatched offer and not shown as a deal.
Independence and affiliate links
Some shop links are affiliate links: we receive a commission on a purchase, and the price does not change for you. Offers are ordered by price, not by commission.